From cd616218d6e60aaf1ae4975af28eef51de0cceb4 Mon Sep 17 00:00:00 2001
From: liyunze <50455574+liyunze-coding@users.noreply.github.com>
Date: Wed, 2 Sep 2026 15:46:01 +0800
Subject: [PATCH] changed unit paths, added links to unit page

---
 src/lib/components/FeedRow.svelte     | 14 +++--
 src/lib/components/UnitRail.svelte    | 40 +++++++++++++-
 src/lib/paths.ts                      |  7 +++
 src/lib/server/api.ts                 | 80 ++++++++++++++++++---------
 src/lib/types.ts                      |  2 +
 src/routes/+page.svelte               |  3 +-
 src/routes/[code]/+page.svelte        |  5 ++
 src/routes/[code]/[id]/+page.svelte   | 44 +++++++++++++++
 src/routes/notes/+page.svelte         |  3 +-
 src/routes/notes/[id]/+page.svelte    | 28 +++++++---
 src/routes/post/note/+page.svelte     | 14 +++--
 src/routes/post/question/+page.svelte | 14 +++--
 src/routes/questions/+page.svelte     |  3 +-
 src/routes/search/+page.svelte        | 11 +++-
 src/routes/topics/[slug]/+page.svelte | 12 +++-
 src/routes/units/+page.svelte         | 16 ++++--
 src/routes/units/[code]/+page.svelte  |  5 +-
 17 files changed, 236 insertions(+), 65 deletions(-)
 create mode 100644 src/lib/paths.ts
 create mode 100644 src/routes/[code]/+page.svelte
 create mode 100644 src/routes/[code]/[id]/+page.svelte

diff --git a/src/lib/components/FeedRow.svelte b/src/lib/components/FeedRow.svelte
index 720c4a0..bc743c8 100644
--- a/src/lib/components/FeedRow.svelte
+++ b/src/lib/components/FeedRow.svelte
@@ -1,4 +1,5 @@
 <script lang="ts">
+	import { unitPath } from "$lib/paths";
 	import VoteStack from "./VoteStack.svelte";
 
 	let {
@@ -24,20 +25,21 @@
 
 <article class="border-rule flex gap-4 border-b py-5">
 	<VoteStack count={voteCount} {targetType} {targetId} />
-	<a {href} class="group min-w-0 flex-1">
+	<div class="group min-w-0 flex-1">
 		{#if tag}
 			<p class="text-secondary mb-1 text-[10px] font-semibold tracking-[0.16em] uppercase">
 				{tag}
 			</p>
 		{/if}
 		{#if unitCode}
-			<p class="kicker">{unitCode}</p>
+			<a href={unitPath(unitCode.split(" / ")[0])} class="kicker">{unitCode}</a><br />
 		{/if}
-		<h3
-			class="text-ink group-hover:text-primary mt-1 font-sans text-[15px] leading-snug font-semibold"
+		<a
+			{href}
+			class="text-ink hover:text-primary mt-1 font-sans text-[15px] leading-snug font-semibold"
 		>
 			{title}
-		</h3>
+		</a>
 		<p class="kicker mt-1.5">{meta}</p>
-	</a>
+	</div>
 </article>
diff --git a/src/lib/components/UnitRail.svelte b/src/lib/components/UnitRail.svelte
index 7b097d3..af640a7 100644
--- a/src/lib/components/UnitRail.svelte
+++ b/src/lib/components/UnitRail.svelte
@@ -28,6 +28,8 @@
 		if (!token) return;
 		try {
 			pinnedIds = (await query("units:getPinned", { token })) as string[];
+			selectedUnitId =
+				units.find((unit) => pinnedIds.includes(unit._id))?._id ?? units[0]?._id ?? "";
 		} catch {
 			// ignore
 		}
@@ -35,6 +37,8 @@
 
 	const isPinned = (id: string) => pinnedIds.includes(id);
 	const canPinMore = $derived(pinnedIds.length < MAX_PINS);
+	const pinnedUnits = $derived(units.filter((u) => pinnedIds.includes(u._id)));
+	const unpinnedUnits = $derived(units.filter((u) => !pinnedIds.includes(u._id)));
 
 	async function togglePin(unit: UnitDoc) {
 		const token = getToken();
@@ -79,7 +83,41 @@
 {/snippet}
 
 <div class="unit-rail">
-	{#each units as unit (unit._id)}
+	{#each pinnedUnits as unit (unit._id)}
+		<div class="unit-card {selectedUnitId === unit._id ? 'unit-card-active' : ''}">
+			<button
+				type="button"
+				class="flex h-full w-full flex-col items-start gap-1 text-left"
+				onclick={() => (selectedUnitId = unit._id)}
+				aria-label="Select {unit.code}"
+			>
+				<span class="text-ink font-serif text-base leading-tight"
+					>{unit.code}{unit.code2 ? ` / ${unit.code2}` : ""}</span
+				>
+				<span class="text-muted line-clamp-2 text-xs leading-snug">{unit.name}</span>
+			</button>
+			{#if authed}
+				<button
+					type="button"
+					class="pin-btn {isPinned(unit._id)
+						? 'pin-btn-active'
+						: ''} absolute top-1.5 right-1.5 z-10"
+					onclick={() => togglePin(unit)}
+					disabled={busy || (!isPinned(unit._id) && !canPinMore)}
+					title={isPinned(unit._id)
+						? "Unpin unit"
+						: canPinMore
+							? "Pin unit"
+							: "You can pin up to 10 units"}
+					aria-label={isPinned(unit._id) ? "Unpin unit" : "Pin unit"}
+				>
+					{@render pinIcon()}
+				</button>
+			{/if}
+		</div>
+	{/each}
+
+	{#each unpinnedUnits as unit (unit._id)}
 		<div class="unit-card {selectedUnitId === unit._id ? 'unit-card-active' : ''}">
 			<button
 				type="button"
diff --git a/src/lib/paths.ts b/src/lib/paths.ts
new file mode 100644
index 0000000..965f95e
--- /dev/null
+++ b/src/lib/paths.ts
@@ -0,0 +1,7 @@
+export function unitPath(code: string): string {
+	return `/${encodeURIComponent(code)}`;
+}
+
+export function postPath(code: string, postId: string): string {
+	return `${unitPath(code)}/${encodeURIComponent(postId)}`;
+}
diff --git a/src/lib/server/api.ts b/src/lib/server/api.ts
index f4741fc..8e04a9d 100644
--- a/src/lib/server/api.ts
+++ b/src/lib/server/api.ts
@@ -88,6 +88,21 @@ function mapQuestion(row: Record<string, any>): Record<string, any> {
 	return { ...row, solved: !!row.solved };
 }
 
+function addUnits(db: Db, rows: Record<string, any>[]): Record<string, any>[] {
+	const units = new Map<string, Record<string, any>>();
+	const getUnit = db.prepare(
+		"SELECT id AS _id, code, code2, name, description FROM units WHERE id = ?",
+	);
+
+	return rows.map((row) => {
+		if (!units.has(row.unitId)) {
+			const unit = getUnit.get(row.unitId) as Record<string, any> | undefined;
+			if (unit) units.set(row.unitId, unit);
+		}
+		return { ...row, unit: units.get(row.unitId) ?? null };
+	});
+}
+
 // ---- users ----
 
 function issueSession(db: Db, user: { _id: string; name: string; role?: string }) {
@@ -375,22 +390,31 @@ function notesCreate(
 function notesList(db: Db, args: { topicId?: string; unitId?: string; limit?: number }) {
 	const limit = args.limit ?? 50;
 	if (args.topicId) {
-		return db
-			.prepare(
-				`SELECT ${NOTE_COLUMNS} FROM notes WHERE topicId = ? ORDER BY createdAt DESC LIMIT ?`,
-			)
-			.all(args.topicId, limit);
+		return addUnits(
+			db,
+			db
+				.prepare(
+					`SELECT ${NOTE_COLUMNS} FROM notes WHERE topicId = ? ORDER BY createdAt DESC LIMIT ?`,
+				)
+				.all(args.topicId, limit) as Record<string, any>[],
+		);
 	}
 	if (args.unitId) {
-		return db
-			.prepare(
-				`SELECT ${NOTE_COLUMNS} FROM notes WHERE unitId = ? ORDER BY createdAt DESC LIMIT ?`,
-			)
-			.all(args.unitId, limit);
+		return addUnits(
+			db,
+			db
+				.prepare(
+					`SELECT ${NOTE_COLUMNS} FROM notes WHERE unitId = ? ORDER BY createdAt DESC LIMIT ?`,
+				)
+				.all(args.unitId, limit) as Record<string, any>[],
+		);
 	}
-	return db
-		.prepare(`SELECT ${NOTE_COLUMNS} FROM notes ORDER BY createdAt DESC LIMIT ?`)
-		.all(limit);
+	return addUnits(
+		db,
+		db
+			.prepare(`SELECT ${NOTE_COLUMNS} FROM notes ORDER BY createdAt DESC LIMIT ?`)
+			.all(limit) as Record<string, any>[],
+	);
 }
 
 function notesSearch(db: Db, args: { query: string; limit?: number }) {
@@ -398,10 +422,13 @@ function notesSearch(db: Db, args: { query: string; limit?: number }) {
 		.prepare(`SELECT ${NOTE_COLUMNS} FROM notes ORDER BY createdAt DESC LIMIT ?`)
 		.all(args.limit ?? 200) as Record<string, any>[];
 	const q = args.query.toLowerCase();
-	return all.filter(
-		(n) =>
-			String(n.title).toLowerCase().includes(q) ||
-			String(n.content).toLowerCase().includes(q),
+	return addUnits(
+		db,
+		all.filter(
+			(n) =>
+				String(n.title).toLowerCase().includes(q) ||
+				String(n.content).toLowerCase().includes(q),
+		),
 	);
 }
 
@@ -499,7 +526,7 @@ function questionsList(db: Db, args: { topicId?: string; unitId?: string; limit?
 						)
 						.all(limit)
 	) as Record<string, any>[];
-	return rows.map(mapQuestion);
+	return addUnits(db, rows.map(mapQuestion));
 }
 
 function questionsGetById(db: Db, args: { id: string }) {
@@ -514,13 +541,16 @@ function questionsSearch(db: Db, args: { query: string; limit?: number }) {
 		.prepare(`SELECT ${QUESTION_COLUMNS} FROM questions ORDER BY createdAt DESC LIMIT ?`)
 		.all(args.limit ?? 200) as Record<string, any>[];
 	const q = args.query.toLowerCase();
-	return all
-		.filter(
-			(qr) =>
-				String(qr.title).toLowerCase().includes(q) ||
-				String(qr.content).toLowerCase().includes(q),
-		)
-		.map(mapQuestion);
+	return addUnits(
+		db,
+		all
+			.filter(
+				(qr) =>
+					String(qr.title).toLowerCase().includes(q) ||
+					String(qr.content).toLowerCase().includes(q),
+			)
+			.map(mapQuestion),
+	);
 }
 
 function searchAll(db: Db, args: { query: string; limit?: number }) {
diff --git a/src/lib/types.ts b/src/lib/types.ts
index 24f3809..aeae741 100644
--- a/src/lib/types.ts
+++ b/src/lib/types.ts
@@ -36,6 +36,7 @@ export type NoteDoc = Doc<"notes"> & {
 	updatedAt: number;
 	voteCount: number;
 	commentCount: number;
+	unit?: UnitDoc;
 };
 
 export type QuestionDoc = Doc<"questions"> & {
@@ -50,6 +51,7 @@ export type QuestionDoc = Doc<"questions"> & {
 	voteCount: number;
 	answerCount: number;
 	solved: boolean;
+	unit?: UnitDoc;
 };
 
 export type SearchResult = (NoteDoc & { type: "note" }) | (QuestionDoc & { type: "question" });
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 476db1a..b791d17 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -1,5 +1,6 @@
 <script lang="ts">
 	import { query } from "$lib/api";
+	import { unitPath } from "$lib/paths";
 	import { onMount } from "svelte";
 	import type { UnitDoc } from "$lib/types";
 
@@ -49,7 +50,7 @@
 		{:else}
 			<div class="unit-rail">
 				{#each units as unit}
-					<a href="/units/{unit.code}" class="unit-card group flex flex-col gap-1">
+					<a href={unitPath(unit.code)} class="unit-card group flex flex-col gap-1">
 						<span
 							class="text-ink group-hover:text-primary font-serif text-base leading-tight"
 							>{unit.code}{unit.code2 ? ` / ${unit.code2}` : ""}</span
diff --git a/src/routes/[code]/+page.svelte b/src/routes/[code]/+page.svelte
new file mode 100644
index 0000000..9add293
--- /dev/null
+++ b/src/routes/[code]/+page.svelte
@@ -0,0 +1,5 @@
+<script lang="ts">
+	import UnitPage from "../units/[code]/+page.svelte";
+</script>
+
+<UnitPage />
diff --git a/src/routes/[code]/[id]/+page.svelte b/src/routes/[code]/[id]/+page.svelte
new file mode 100644
index 0000000..9a59330
--- /dev/null
+++ b/src/routes/[code]/[id]/+page.svelte
@@ -0,0 +1,44 @@
+<script lang="ts">
+	import { page } from "$app/state";
+	import { query } from "$lib/api";
+	import { onMount } from "svelte";
+	import NotePage from "../../notes/[id]/+page.svelte";
+	import QuestionPage from "../../questions/[id]/+page.svelte";
+
+	let postType: "note" | "question" | null = $state(null);
+	let loading = $state(true);
+
+	onMount(async () => {
+		const note = await query("details:getNoteWithDetails", { id: page.params.id });
+		const result =
+			note ?? (await query("details:getQuestionWithDetails", { id: page.params.id }));
+		const unit = result?.unit;
+		const requestedCode = (page.params.code ?? "").toLowerCase();
+
+		if (
+			result &&
+			unit &&
+			[unit.code, unit.code2].some((code) => code?.toLowerCase() === requestedCode)
+		) {
+			postType = note ? "note" : "question";
+		}
+		loading = false;
+	});
+</script>
+
+{#if loading}
+	<div class="page">
+		<p class="kicker py-16">Loading</p>
+	</div>
+{:else if postType === "note"}
+	<NotePage />
+{:else if postType === "question"}
+	<QuestionPage />
+{:else}
+	<div class="page">
+		<h1 class="text-ink font-serif text-3xl">Post not found</h1>
+		<a href="/" class="text-secondary hover:text-secondary-dark mt-2 inline-block text-sm"
+			>Home</a
+		>
+	</div>
+{/if}
diff --git a/src/routes/notes/+page.svelte b/src/routes/notes/+page.svelte
index 5986611..4031465 100644
--- a/src/routes/notes/+page.svelte
+++ b/src/routes/notes/+page.svelte
@@ -3,6 +3,7 @@
 	import { onMount } from "svelte";
 	import FeedRow from "$lib/components/FeedRow.svelte";
 	import UnitFilter from "$lib/components/UnitFilter.svelte";
+	import { postPath } from "$lib/paths";
 	import { timeAgo } from "$lib/time";
 	import type { NoteDoc, UnitDoc } from "$lib/types";
 
@@ -79,7 +80,7 @@
 	{:else}
 		{#each visible as note}
 			<FeedRow
-				href="/notes/{note._id}"
+				href={postPath(note.unit!.code, note._id)}
 				title={note.title}
 				unitCode={note.unit
 					? note.unit.code + (note.unit.code2 ? ` / ${note.unit.code2}` : "")
diff --git a/src/routes/notes/[id]/+page.svelte b/src/routes/notes/[id]/+page.svelte
index 91e3515..2dafa03 100644
--- a/src/routes/notes/[id]/+page.svelte
+++ b/src/routes/notes/[id]/+page.svelte
@@ -44,7 +44,9 @@
 	});
 
 	async function reloadComments() {
-		const updated = await query("details:getNoteWithDetails", { id: page.params.id });
+		const updated = await query("details:getNoteWithDetails", {
+			id: page.params.id,
+		});
 		if (updated) comments = (updated as any).comments ?? [];
 	}
 
@@ -123,7 +125,9 @@
 				title: editTitle.trim(),
 				content: editContent.trim(),
 			});
-			const updated = await query("details:getNoteWithDetails", { id: note._id });
+			const updated = await query("details:getNoteWithDetails", {
+				id: note._id,
+			});
 			if (updated) {
 				note = updated as NoteDoc;
 				topic = (updated as any).topic ?? null;
@@ -150,13 +154,19 @@
 		<div class="flex gap-5">
 			<VoteStack count={note.voteCount} targetType="note" targetId={note._id} />
 			<div class="min-w-0 flex-1">
-				<p class="kicker">
-					{#if unit}{unit.code}{unit.code2
-							? ` / ${unit.code2}`
-							: ""}{/if}{#if unit && topic}
-						·
-					{/if}{#if topic}{topic.name}{/if}
-				</p>
+				<div class="kicker">
+					{#if unit}
+						<a href={`/${unit.code}`} class="hover:text-primary">
+							{unit.code}{unit.code2 ? ` / ${unit.code2}` : ""}
+						</a>
+					{/if}
+					{#if unit && topic}
+						{" · "}
+					{/if}
+					{#if topic}
+						{topic.name}
+					{/if}
+				</div>
 				{#if editMode}
 					<input
 						type="text"
diff --git a/src/routes/post/note/+page.svelte b/src/routes/post/note/+page.svelte
index e836d01..5026273 100644
--- a/src/routes/post/note/+page.svelte
+++ b/src/routes/post/note/+page.svelte
@@ -5,6 +5,7 @@
 	import { onMount } from "svelte";
 	import { get } from "svelte/store";
 	import MarkdownEditor from "$lib/components/MarkdownEditor.svelte";
+	import { postPath } from "$lib/paths";
 	import type { TopicDoc, UnitDoc } from "$lib/types";
 
 	let topics: TopicDoc[] = $state([]);
@@ -51,16 +52,19 @@
 		loading = true;
 		try {
 			let unitId = selectedUnitId;
+			let unitCode = units.find((unit) => unit._id === unitId)?.code ?? "";
 			if (useCustomUnit && customUnit.trim()) {
-				const existing = units.find(
-					(u) => u.code.toLowerCase() === customUnit.trim().toUpperCase(),
+				unitCode = customUnit.trim().toUpperCase();
+				const existing = units.find((u) =>
+					[u.code, u.code2].some((code) => code?.toUpperCase() === unitCode),
 				);
 				if (existing) {
 					unitId = existing._id;
+					unitCode = existing.code;
 				} else {
 					unitId = (await mutation("units:createCustom", {
-						code: customUnit.trim().toUpperCase(),
-						name: customUnit.trim().toUpperCase(),
+						code: unitCode,
+						name: unitCode,
 					})) as string;
 				}
 			}
@@ -73,7 +77,7 @@
 				unitId,
 			})) as string;
 
-			goto(`/notes/${id}`);
+			goto(postPath(unitCode, id));
 		} catch (err: any) {
 			error = err.message ?? "Failed to publish note";
 		} finally {
diff --git a/src/routes/post/question/+page.svelte b/src/routes/post/question/+page.svelte
index 7b9a2d4..f64a6b7 100644
--- a/src/routes/post/question/+page.svelte
+++ b/src/routes/post/question/+page.svelte
@@ -5,6 +5,7 @@
 	import { onMount } from "svelte";
 	import { get } from "svelte/store";
 	import MarkdownEditor from "$lib/components/MarkdownEditor.svelte";
+	import { postPath } from "$lib/paths";
 	import type { TopicDoc, UnitDoc } from "$lib/types";
 
 	let topics: TopicDoc[] = $state([]);
@@ -51,16 +52,19 @@
 		loading = true;
 		try {
 			let unitId = selectedUnitId;
+			let unitCode = units.find((unit) => unit._id === unitId)?.code ?? "";
 			if (useCustomUnit && customUnit.trim()) {
-				const existing = units.find(
-					(u) => u.code.toLowerCase() === customUnit.trim().toUpperCase(),
+				unitCode = customUnit.trim().toUpperCase();
+				const existing = units.find((u) =>
+					[u.code, u.code2].some((code) => code?.toUpperCase() === unitCode),
 				);
 				if (existing) {
 					unitId = existing._id;
+					unitCode = existing.code;
 				} else {
 					unitId = (await mutation("units:createCustom", {
-						code: customUnit.trim().toUpperCase(),
-						name: customUnit.trim().toUpperCase(),
+						code: unitCode,
+						name: unitCode,
 					})) as string;
 				}
 			}
@@ -73,7 +77,7 @@
 				unitId,
 			})) as string;
 
-			goto(`/questions/${id}`);
+			goto(postPath(unitCode, id));
 		} catch (err: any) {
 			error = err.message ?? "Failed to post question";
 		} finally {
diff --git a/src/routes/questions/+page.svelte b/src/routes/questions/+page.svelte
index 2df85ef..f14110b 100644
--- a/src/routes/questions/+page.svelte
+++ b/src/routes/questions/+page.svelte
@@ -3,6 +3,7 @@
 	import { onMount } from "svelte";
 	import FeedRow from "$lib/components/FeedRow.svelte";
 	import UnitFilter from "$lib/components/UnitFilter.svelte";
+	import { postPath } from "$lib/paths";
 	import { timeAgo } from "$lib/time";
 	import type { QuestionDoc, UnitDoc } from "$lib/types";
 
@@ -86,7 +87,7 @@
 	{:else}
 		{#each visible as question}
 			<FeedRow
-				href="/questions/{question._id}"
+				href={postPath(question.unit!.code, question._id)}
 				title={question.title}
 				unitCode={question.unit
 					? question.unit.code + (question.unit.code2 ? ` / ${question.unit.code2}` : "")
diff --git a/src/routes/search/+page.svelte b/src/routes/search/+page.svelte
index 2487161..b64345a 100644
--- a/src/routes/search/+page.svelte
+++ b/src/routes/search/+page.svelte
@@ -2,6 +2,7 @@
 	import { query } from "$lib/api";
 	import { onMount } from "svelte";
 	import FeedRow from "$lib/components/FeedRow.svelte";
+	import { postPath } from "$lib/paths";
 	import { timeAgo } from "$lib/time";
 	import type { SearchResult } from "$lib/types";
 
@@ -51,8 +52,11 @@
 		{#each results as result}
 			{#if result.type === "note"}
 				<FeedRow
-					href="/notes/{result._id}"
+					href={postPath(result.unit!.code, result._id)}
 					title={result.title}
+					unitCode={result.unit
+						? result.unit.code + (result.unit.code2 ? ` / ${result.unit.code2}` : "")
+						: undefined}
 					meta="{result.authorName} · {timeAgo(
 						result.createdAt,
 					)} · {result.commentCount} comment{result.commentCount === 1 ? '' : 's'}"
@@ -63,8 +67,11 @@
 				/>
 			{:else}
 				<FeedRow
-					href="/questions/{result._id}"
+					href={postPath(result.unit!.code, result._id)}
 					title={result.title}
+					unitCode={result.unit
+						? result.unit.code + (result.unit.code2 ? ` / ${result.unit.code2}` : "")
+						: undefined}
 					meta="{result.authorName} · {timeAgo(
 						result.createdAt,
 					)} · {result.answerCount} answer{result.answerCount === 1 ? '' : 's'}"
diff --git a/src/routes/topics/[slug]/+page.svelte b/src/routes/topics/[slug]/+page.svelte
index 0917817..4bef178 100644
--- a/src/routes/topics/[slug]/+page.svelte
+++ b/src/routes/topics/[slug]/+page.svelte
@@ -3,6 +3,7 @@
 	import { page } from "$app/state";
 	import { onMount } from "svelte";
 	import FeedRow from "$lib/components/FeedRow.svelte";
+	import { postPath } from "$lib/paths";
 	import { timeAgo } from "$lib/time";
 	import type { NoteDoc, QuestionDoc, TopicDoc } from "$lib/types";
 
@@ -45,8 +46,11 @@
 			<p class="kicker border-rule mt-10 border-t pt-8">Notes</p>
 			{#each notes as note}
 				<FeedRow
-					href="/notes/{note._id}"
+					href={postPath(note.unit!.code, note._id)}
 					title={note.title}
+					unitCode={note.unit
+						? note.unit.code + (note.unit.code2 ? ` / ${note.unit.code2}` : "")
+						: undefined}
 					meta="{note.authorName} · {timeAgo(
 						note.createdAt,
 					)} · {note.commentCount} comment{note.commentCount === 1 ? '' : 's'}"
@@ -61,8 +65,12 @@
 			<p class="kicker border-rule mt-10 border-t pt-8">Questions</p>
 			{#each questions as question}
 				<FeedRow
-					href="/questions/{question._id}"
+					href={postPath(question.unit!.code, question._id)}
 					title={question.title}
+					unitCode={question.unit
+						? question.unit.code +
+							(question.unit.code2 ? ` / ${question.unit.code2}` : "")
+						: undefined}
 					meta="{question.authorName} · {timeAgo(
 						question.createdAt,
 					)} · {question.answerCount} answer{question.answerCount === 1 ? '' : 's'}"
diff --git a/src/routes/units/+page.svelte b/src/routes/units/+page.svelte
index 3fd23b6..64d2f4b 100644
--- a/src/routes/units/+page.svelte
+++ b/src/routes/units/+page.svelte
@@ -3,6 +3,7 @@
 	import { onMount } from "svelte";
 	import FeedRow from "$lib/components/FeedRow.svelte";
 	import UnitRail from "$lib/components/UnitRail.svelte";
+	import { postPath } from "$lib/paths";
 	import { timeAgo } from "$lib/time";
 	import type { NoteDoc, QuestionDoc, UnitDoc } from "$lib/types";
 
@@ -70,13 +71,18 @@
 		{#if selectedUnit}
 			<div class="pt-6">
 				<div class="flex flex-wrap items-baseline justify-between gap-x-4 gap-y-1">
-					<h2 class="text-ink font-serif text-2xl font-medium">
+					<a
+						href={`/${selectedUnit.code}`}
+						class="text-ink hover:text-primary font-serif text-2xl font-medium"
+					>
 						{selectedUnit.code}{selectedUnit.code2 ? ` / ${selectedUnit.code2}` : ""}
-					</h2>
+					</a>
 					<p class="text-muted text-sm">{selectedUnit.name}</p>
 				</div>
 				{#if selectedUnit.description}
-					<p class="text-muted mt-1 text-sm">{selectedUnit.description}</p>
+					<p class="text-muted mt-1 text-sm">
+						{selectedUnit.description}
+					</p>
 				{/if}
 
 				{#if contentLoading}
@@ -86,7 +92,7 @@
 						<p class="kicker border-rule mt-8 border-t pt-8">Notes</p>
 						{#each notes as note}
 							<FeedRow
-								href="/notes/{note._id}"
+								href={postPath(selectedUnit.code, note._id)}
 								title={note.title}
 								unitCode={selectedUnit.code +
 									(selectedUnit.code2 ? ` / ${selectedUnit.code2}` : "")}
@@ -106,7 +112,7 @@
 						<p class="kicker border-rule mt-8 border-t pt-8">Questions</p>
 						{#each questions as question}
 							<FeedRow
-								href="/questions/{question._id}"
+								href={postPath(selectedUnit.code, question._id)}
 								title={question.title}
 								unitCode={selectedUnit.code +
 									(selectedUnit.code2 ? ` / ${selectedUnit.code2}` : "")}
diff --git a/src/routes/units/[code]/+page.svelte b/src/routes/units/[code]/+page.svelte
index e4edc27..c3eee94 100644
--- a/src/routes/units/[code]/+page.svelte
+++ b/src/routes/units/[code]/+page.svelte
@@ -3,6 +3,7 @@
 	import { page } from "$app/state";
 	import { onMount } from "svelte";
 	import FeedRow from "$lib/components/FeedRow.svelte";
+	import { postPath } from "$lib/paths";
 	import { timeAgo } from "$lib/time";
 	import type { NoteDoc, QuestionDoc, UnitDoc } from "$lib/types";
 
@@ -48,7 +49,7 @@
 			<p class="kicker border-rule mt-10 border-t pt-8">Notes</p>
 			{#each notes as note}
 				<FeedRow
-					href="/notes/{note._id}"
+					href={postPath(unit.code, note._id)}
 					title={note.title}
 					unitCode={unit.code + (unit.code2 ? ` / ${unit.code2}` : "")}
 					meta="{note.authorName} · {timeAgo(
@@ -65,7 +66,7 @@
 			<p class="kicker border-rule mt-10 border-t pt-8">Questions</p>
 			{#each questions as question}
 				<FeedRow
-					href="/questions/{question._id}"
+					href={postPath(unit.code, question._id)}
 					title={question.title}
 					unitCode={unit.code + (unit.code2 ? ` / ${unit.code2}` : "")}
 					meta="{question.authorName} · {timeAgo(